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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	15. SUBSEQUENT EVENTS On April 7, 2014, we issued 9,200,000 shares of class A common stock in a public offering at a price to the underwriters of $27.72 per share. We generated net proceeds from the issuance of $254.6 million after underwriting discounts and other estimated offering expenses.